Does an iTunes iOS device backup include all of the application data on the device? I assume it doesn't include a second copy of your iTunes data as this is already on your Mac anyway. But I downloaded a lot of videos with the TED app on my device, while the size of the device's backup (*) seems comparatively small. Are these not included in the backup? If so, what other data might not be included? Is there a way to know what exactly is included or not (other than restoring from the backup)?
(*) = the folder ~/Library/Application Support/MobileSync/Backup